cwsbuilderslab

Open & inspect HAR files locally — waterfall, requests, headers, bodies, timings. 100% offline; nothing is uploaded.

Auto-refresh any page at your interval, and auto-stop + notify when a word or element appears (e.g. "In Stock"). Per-site & private.

Right-click any WebP or AVIF image and save it as PNG or JPG. 100% local — your images never leave your device.

Automatically clears cookies for sites once you've closed them. Keep-list for your logins. 100% local, no tracking.

Back up all your cookies to a JSON file and restore them — for backups, account switching and moving sessions. 100% local.

Stops videos and audio from autoplaying. Per-site allow-list for sites where you want it. 100% local, no tracking.

Export any table or data grid to Excel (.xlsx), CSV, or Google Sheets. No account, 100% local.

Extract a website's design tokens — colors, type, spacing, shadows — and export to CSS variables, Tailwind & JSON. 100% local.

Convert prices on any website to your currency. Hover to see the original. Free, unlimited, no account, 100% local.

One-click web font inspector — see which fonts loaded vs fell back, list every @font-face, flag font-display issues, export.

One-click citation generator — turn the page you're on into an APA 7 or MLA 9 citation, with editable fields and BibTeX/RIS export.

One-click WCAG color-contrast audit for any page — find failures, simulate color blindness, export a compliance report. Local.

Rewrite & paraphrase text in 5 modes using your own AI provider key — no subscription, no caps; your key stays on your device.